The physicist's greatest tool is his wastebasket.

While you're trying to get ahead, remember to get aheart as well. When your only problem IS a nail, all you want is a decent hammer. There are only two ways to live your life: one is as though nothing is a miracle; the other is as though everything is a miracle.

In the matter of physics, the first lessons should contain nothing but what is experimental and interesting to see. A pretty experiment is in itself often more valuable than twenty formulae extracted from our minds.

A theory is the more impressive the greater is the simplicity of its premises, the more different are the kinds of things it relates and the more extended the range of its applicability.

Warfare cannot be humanized.

At present every coachman and every waiter argues about whether or not the relativity theory is correct.

It is only to the individual that a soul is given.